Launcher3 -

is the open-source base for the home screen and app drawer on Android devices. It is the third major iteration of the default Android Open Source Project (AOSP) launcher, serving as the blueprint for nearly all modern Android interfaces, including the Google Pixel Launcher. Core Functionality

A class that determines which applications should be visible in the app list (e.g., hiding system-only apps). launcher3

Launcher3 is a specialized application that provides the primary interface for user interaction: is the open-source base for the home screen